float64 x
float64 y
float64 z
float64 r    # if != 0, circular ROI of radius r
float64 l_x  # if r == 0, length of AABB on x
float64 l_y  # if r == 0, length of AABB on y
float64 l_z  # if r == 0, length of AABB on z
